Dust bag



Aug. 14, 1934. B. KERN DUST BAG Filed June 4, 1931 3 Sheets-Sheet lpill-ll I III]: 1||l ,Bernard ji'erw' Aug. 14, 1934. KERN DUST BAG FiledJune 4, 1951 3 Sheets-Sheet 2 Aug. 14, 1934. B. KERN 'DUST BAG FiledJune 4, 1931 5 Sheets-Sheet I5 jernard jiern/ Patented Aug. 14, 1934UNITED STATES DUST BAG Bernard Kern, Syracuse, N. Y.

Application June 4, 1931, Serial No. 542,130

4Claims.

My invention relates to new and useful improvements in a receptacle ordust bag adapted to be used in connection with vacuum or suctioncleaners and it is the principal object of the I invention to constructa bag of the character described in such a manner as to allow for aconstant flow of air at a constant velocity and in such a manner thatthe back pressure remains constant after the walls of the bag are oncesaturated with dust.

It is a further object of my invention to provide a dust bag of thecharacter described in which there is an interiorly formed pocket toreceive the dust, said pocket being so positioned 16 relative to theinlet opening as to direct incoming dust ladened air towards one wall ofthe bag thus allowing a great percentage of the air to pass through thebag at this point while the remaining air is carried upwardly andallowed 20 to expand into the upper portion of the bag and discharge thedust into the pocket.

Still another object of the invention consists in forming the rear wallof the body of the bag in such a manner as to provide an outwardlydirected dip thereby increasing the area of the bag adjacent the upperedge of the pocket the dip forming a releasing point for the dustwhereby it is directed into the pocket. In expanding at the upperportion of the bag, above the up- 3 per edge of the pocket, the airtakes the natural course of a circle and the bag is of the largest crosssection at the point where the dip is formed.

A still further object of the invention resides 36 in forming thesection forming the back portion of the bag in such a manner as toprovide the dip, the member or partition forming the pocket beingconnected to the rear section of the bag in a novel manner to providefor the contraction of the body, crossways thereof, to aid in formin:the dip.

In dust bags for the purpose described, now

' commonly in use, unless the bag is cleaned after each use of thecleaner the volume and velocity of the air changes because at eachcleaning the volume of dust is increased and all of the dust in the bagis carried upwards and held to the walls o! the bag by the escaping airthereby causm ing back pressure against the fan used in creating thevacuum or suction. In carrying forward my present invention the bag isconstructed in such a manner as to allow for a-constant flow of air at aconstant velocity and in such a mannor that the back pressure remainsconstant after the walls of the bag are once with dust.

vSo far asthere is common subject matter the present application is acontinuation in part of my application filed Februry 20, 1926, Serial 0-No. 89,648, which application has been abandoned.

With the above and other objects in view. which will appear as thedescription proceeds, my invention consists in the novel details ofconstruction and arrangement of parts, described 66 in the followingspecification and illustrated in the accompanying drawings, and while Ihave illustrated and described the preferred embodiments of theinvention, as they now appear to me, it will be understood that suchchanges may 70 be made as will fall within the scope of the appendedclaims.

In the drawings:-

Fig. 1 is a front elevation.

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1.

Fig. 3 is a top plan.

Fig. 4 is a plan showing the blank from which the front section of thebag is made.

Fig. 5 is a plan showing the blank, of two parts, from which the rearsection of the bag is formed.

Fig. 6 is a plan of the blank which forms the partition for the pocketwithin the bag.

Fig. '7 is a fragmental detail of the fabric used in constructing thebag showing two layers of the fabric secured together to form the blanksdisclosed in Figs. 4 and 5.

Fig. 8 shows a modified form of blank from which the partition to formthe pocket is made; and

Fig. 9 is a longitudinal section through a modifled form of bag'in whichtwo pockets are provided, the form of bag shown'in this figure beingparticularly adapted for use in connectionwith a larger type of cleanerthan that commonly used 05 for domestic purposes and in which a largerfan is used having a capacity of discharging a much larger volume of airthan the fan commonly used in domestic cleaners.

In the drawings 1 indicates the body portion of the bag restrictedtransversely, intermediate its ends, as shown at 2, and provided at thelower end with a restricted or reduced extension 3 adapted to be securedby a sleeve, not shown, or

saturated many other manner to the vacuum or suction cleaner. The upperportion of the bag is formed in such a manner as to be normally closedby the clamp' 4 and when the clamp is removed, for cleaning the bag, toprovide. a relatively large opening whereby the dust or litter may slideout by shaking the bag from the inlet end, it not being necessary forthe operator to use his or her hands in removing the dust or litter. Thebody of the bag is constructed from the blanks shown more particularlyin Figs. 4 and 5 of the drawings, the blank 5 shown in Fig. 4 being usedfor forming the front portion of the bag and the blank shown in Fig. 5being used for forming the rear section. The blank shown in Fig. 5 isformed of two portions 6 and 7 the inner edges of which are curved asshown at 8 and 9 respectively and are adapted to be secured together bystitching. By stitching 'on the curved lines 8 and 9 an outwardlyextending dip is formed in the rear portion of the bag as showngenerally at 10, thisdip being of particular advantage in depositing thedust or litter, from the currents of air, into the pocket to be laterdescribed. At the upper end the blank 5 is formed at the sides with theupwardly directed pointed extensions 11 and the portion 6 of the blankshown in Fig. 5 is formed at the upper edge with the upwardly directedpointed extensions 12. The blanks shown in Figs. 4 and 5 will be securedtogether along their 1ongitudinal edges by stitching as shown at 13 andwhen the upper end of the bag is to be closed the extensions 11 will befolded on the lines a, b and c to form inwardly directed pleats and thepointed extensions 12 of the blank shown in Fig. 5 will be similarlyfolded on the lines (1, e and f to form inwardly directed pleats. Whenso folded the upper end of the bag will be somewhat restricted toreceive the clamp 4 but it will be understood that when the cleaner isbeing operated that air discharged into the bag .will force or blowportions of the pleats outwardly as shown more particularly at g in Fig.1 of the drawings. Each of the blanks shown in Figs. 4 and 5 is formedof two layers of the material as shown at 14 and 15 more particularly inFig. 7 of the drawings, these layers being secured together by thelongitudinally extending rows of stitching h, i and a. By using the twolayers of material the air in escaping through the fabric will take anindirect course. The surface of the fabric is woolly and formed with anap and when the two layers of cloth are sewed together there will be adouble thickness of the nap which will cause the air to take an indirectpassage through the two layers of fabric. The nap will retain the dust.

For receiving the dust or litter discharged from the circulating air,within the bag, I provide the pocket indicated at 16, this pocket beingformed by securing the partition formed by the blank 1'7 interiorly ofthe bag as shown more particularly in Fig. 2 of the drawings, thispartition being-secured within the bag by stitching along the edges 18and at the bottom as shown at 19. This partition is of such a width asto slightly draw in the side edges of the bag to form the restrictedportion 2 and to aid in causing the bag to assume the shape to providethe dip 10. when the bag is supported in an inclined position, in use,as shown more particu-' larly in Fig. 2 of the drawings, the partitionforming the pocket will naturally fall inwardly a short distance asshown in Fig. 2 or in other words the center portion will assume aposition slightly inward of the stitching 18. The edges of the bottompartition ,are secured to the rear section of the bag.

It will be noted that the top edge of the partition shown at k is on asomewhat higher plane than the point 112 wherethe portions 6 and 7 ofthe rear section of thebag are stitched together on the curved lines 8and 9. The purpose of this will be later apparent.

The bottom portion of the pocket formed by the partition 1'7 partlyobstruct passage through the inlet opening formed by the extension 3 andas the air is discharged, with the dust or litter from the cleaner intothe bag through the restricted inletopening it strikes the bottom of thepocket, as shown by the arrows in Fig. 2 and is directed at highvelocity towards the front surface of the bag. I find in practice thatbecause of the high velocity of air there is no discharge of air betweenthe points it and 0 but there is a discharge of air between the points 0and p, a small amount of dust accumulating on the wall between thepoints 0 and p. After reaching a point above the top edge of the pocketthe air expands forming its own circle as shown by the arrows r anddischarges the dust and htter into the pocket. The-rear wall of thepocket is the first to become saturated with the dust so as to entirelyseal the same and prevent any air from getting through. The circulatingair above the pocket acts as a weight on the dust that is within thepocket. It will be understood that the heavier particles or dust andhtter are constantly being thrown out to the extreme periphery of thecircle formed by the air currents and these heavier particles aredischarged at what may be termed the releasing point which isat the dip10. This dip acts as a scoop to receive and direct the heavier particlesof dust and litter into the pocket and the lighter particles of dust andlitter will fall from the air currents into the pocket.

From the above it is thought that the construction and advantages of myimproved form of bag will beclearly understood. In a bag of theconstruction shown and described there is a. constantdischarge of agiven volume of air and the circulating volume of air is intended toconstantly gather and discharge the dust from the dust ladenedcirculating volume of air into the pocket which is beyond the influenceof the cyclonic disturbance in the bag. Also there is no heavyaccumulation of dust on the front portion of the bag between the points0 and p. By providing the top edge of the partition, forming the pocket,on a somewhat higher plane, as shown at k then the point m will aid indirecting the air and dust and htter carried thereby into the pocket. Itwill further seen that with a bag of the construction shown anddescribed that it is not necessary to use a check valve at the inlet endof the bag. Instead the dust and htter is supported within the pocketand so held when the In Fig. 8- of the drawings I have shown slightlymodified form of partition 20 for form ing the pocket. In this form ofpartition the upper edge is somewhat wider than the upper edge of thepartition shown at 17 in Fig. 6 and to reduce this width the materialmay be folded on the lines s, t and u to provide pleats, these pleatstaking up slack in the partition when secured within the bag.

In Fig. 9 of the drawings I have shown a slight- 1y modified formof bagadapted for use in connection with a larger type of cleaner than thatcommonly used for domestic purposes or in other words for use with amachine of the vacuum or suction type which is used for picking up heavyparticles consisting of dust, sand, gravel, small iron pieces or thelike. Such a machine 1 is ordinarily used in factories or warehouses. In

this modified form or bag the body portion is shown at 21 and isprovided with a restricted inlet opening 22 which discharges the debrisladened air into the large upper portion or the bag shown at 23 where itexpands and forms a circle denoted by the arrows 24. The bag is formedwith the p shown at 25 in the same manner as described torthat form ofbag shown in other figures of the drawings and is further provided withthe pockets'26 and 27 as distinguished from the single pocket providedin the preferred i'orm of the invention. These pockets are formed by thepartition 28 and the upper edge of the pocket 2'! is on a somewhathigher plane than the upper edge of the pocket 26 so as to properlydirect the air currents and debris carried thereby into the respectivepockets. The release point for the debris is at the dip 25 which acts asa scoop to discharge the heavier particles into the pocket 26 while thelighter particles will bedischarged into the pocket 27.

In each form of the invention described the largest area of the bag isat the dip. The most natural turn that the air will take will be thelongest radius. At the dip the bag has a scoop shape and the area in thebag is the largest in cross section at this point.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent is:-

1. A dust bag of the character described including' a front wall, a rearwall, an inlet opening for the debris ladened air, and a plurality ofpockets for receiving the debris released from the air, the rear wallhaving an outwardly dipped portion at the point at which the debris isreleased from the air for directing the same into the pockets.

2. A dust bag of the character described including a front wall, a rearwall, an inlet opening for the debris ladened air, and a plurality ofparallel pockets for receiving the debrisreleased from the air, the rearwall having an outwardly dippedportionatthepointatwhichthedebrisisreleased from the drier directingthesame into the pockets.

3.Adustbagincludingirontandrearwalls connected along their longitudinaledges, the rear wall including sections formed of blanks having'arcuate-shaped edge portions adapted to be connected to provide a dipin the rear wall, and a partition connected tothe longitudinallyconnected edges or the walls to form a pocket, said partition drawingthe sids of the walls inwardly to cooperate in forming the dip.

4. A dust bag oi. the character described havinganinletopeningatoneendandnormallyclosed at the opposite end, and apocket positioned within the bag with a portion overlying the inletopening a substantial distance thereabove to initially direct dustladened air entering the inlet opening towards one wall 0! the bag andsaid pocket also'having a wall portion to provide with the wall towardswhich the air is directed arestrictedairpassagethroughwhichtheairiscarried for a substantialdistance and to provide an enlarged space adjacent the closed end intowhich the air is discharged from the restricted passage, the airentering the enlarged space forming a circular current from which thedust is released for deposit into the pocket, the wall of the bagopposite to that towards which the air is initially directed beingformed or sections having arcuateshaped edges connected to provide acontinuous unbroken surface with an outwardly flared dip, the unbrokensurface and dip directing the dust into the pocket. I

